Struct ScrollDriver 

pub struct ScrollDriver { /* private fields */ }

Drives registered animations from a normalised scroll position.

Each call to set_position advances every animation by Δposition / range — a normalised fraction ∈ [0, 1].

Example

use animato_driver::scroll::ScrollDriver;
use animato_core::Update;

struct Counter(u32);
impl Update for Counter {
    fn update(&mut self, _dt: f32) -> bool { self.0 += 1; self.0 < 10 }
}

let mut driver = ScrollDriver::new(0.0, 1000.0);
driver.add(Counter(0));
driver.set_position(250.0);  // 25% through the scroll range
driver.set_position(500.0);  // another 25%

Implementations

impl ScrollDriver

pub fn new(min: f32, max: f32) -> Self

Create a scroll driver over the given position range.

min and max define the full scroll extent. max is clamped to be strictly greater than min.

pub fn add<A: Update + Send + 'static>(&mut self, animation: A)

Register an animation to be driven by scroll changes.

pub fn set_position(&mut self, pos: f32)

Update the scroll position and tick all animations by the normalised delta.

If pos is outside [min, max] it is clamped. Animations receive a dt equal to |Δpos| / (max − min), i.e. a normalised [0, 1] delta.

Completed animations (returning false) are retained so they stay at their terminal value — call clear_completed if you want to remove them.

pub fn clear_completed(&mut self)

Remove all animations that have returned false from their last update.

This is not done automatically, so completed animations stay accessible for value reads after they finish.

pub fn position(&self) -> f32

Current scroll position in user units.

pub fn progress(&self) -> f32

Normalised scroll progress ∈ [0.0, 1.0].

pub fn min(&self) -> f32

Minimum position of the scroll range.

pub fn max(&self) -> f32

Maximum position of the scroll range.

pub fn animation_count(&self) -> usize

Number of registered animations.

Trait Implementations

impl Debug for ScrollDriver

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ScrollDriver

fn default() -> ScrollDriver

Returns the “default value” for a type.